[subset] Fix div-by-zero

7 years ago · 5f17dbc302
parent 21bf147054
commit 5f17dbc302
1 changed files with 3 additions and 0 deletions
--- a/src/hb-subset.cc
+++ b/src/hb-subset.cc
@ -51,6 +51,9 @@ _plan_estimate_subset_table_size (hb_subset_plan_t *plan,
  unsigned int src_glyphs = plan->source->get_num_glyphs ();
  unsigned int dst_glyphs = plan->glyphset->get_population ();

+  if (unlikely (!src_glyphs))
+    return 512 + table_len;
+
  return 512 + (unsigned int) (table_len * sqrt ((double) dst_glyphs / src_glyphs));
 }